18 
TIN DEPOSITS OF THE YORK REGION, ALASKA. 
[no. 229. 
Peninsula. Lost River forks about 1| miles from the coast, one 
branch continuing in a nearly due north direction, while the other 
drains a country to the west that has not be examined by geologists. 
S E A 
Ix'/'A 
Igneous dike 
Granite 
Fig. 3.— Sketch map of Lost River. Scale, f inch=l mile. 
About 4 miles from the coast the north fork of Lost River divides. 
The eastern branch is Cassiterite Creek; the western, which is some- 
what larger, rises about 3 miles to the north, in the slopes of Brooks 
Mountain. 
